The combined use of Er,Cr:YSGG laser and fluoride to prevent root dentin demineralization.

Vinícius Rangel Geraldo-Martins,Juliana Jendiroba Faraoni-Romano,Cesar Penazzo Lepri,Regina Guenka Palma-Dibb

doi:10.1590/1678-775720130570

Vinícius Rangel Geraldo-Martins, Juliana Jendiroba Faraoni-Romano + Show 2 more

Open Access

https://doi.org/10.1590/1678-775720130570

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Abstract

The use of erbium lasers to prevent caries in enamel has shown positive results. However, it is not known if Er,Cr:YSGG laser can also be used to increase acid resistance of root dentine, which is another dental tissue susceptible to the action of cariogenic bacteria.ObjectiveTo analyze the effects of the Er,Cr:YSGG laser (λ=2.78 μm, 20 Hz) irradiation associated with 2% neutral sodium fluoride (NaF) to prevent root dentin demineralization.Material and MethodsOne hundred human root dentin samples were divided into 10 groups (G) and treated as follows: G1: no treatment; G2: NaF; G3: laser (4.64 J/cm2) with water cooling (WC=5.4 mL/min); G4: laser (4.64 J/cm2) without WC; G5: laser (8.92 J/cm2) with WC; G6: laser (8.92 J/cm2) without WC; G7: laser (4.64 J/cm2) with WC and NaF; G8: laser (4.64 J/cm2) without WC and NaF; G9: laser (8.92 J/cm2) with WC and NaF; G10: laser (8.92 J/cm2) without WC and NaF. The NaF gel was applied alone or after 4 min of irradiation. After 14 days of acid challenge, the samples were sectioned and the Knoop microhardness (KHN) test was done at different depths (30, 60, 90 and 120 μm) from the outer dentin surface. Data were analyzed by one-way ANOVA and Fisher's test (α=5%).ResultsThe results showed that G8 and G10 presented higher KHN than the G1 for the depths of 30 and 60 μm, indicating an increase of the acid resistance of the dentin in up to 35% (p<0.05).ConclusionsThe use of Er,Cr:YSGG laser irradiation at 4.64 J/ cm2 and 8.92 J/cm2 without water cooling and associated with 2% NaF can increase the acid resistance of human root dentin.

Highlights

The increase in lifespan associated with the development and application of preventive dentistry concepts have contributed to the maintenance of the teeth in the oral cavity of elderly population
When dentin exposition is combined with some situations common to senility, such as reduced salivary flow due to diseases or drugs and the inability to have proper RUDO K\JLHQH DVVRFLDWHG ZLWK ELR¿OP DFFXPXODWLRQ on tooth surfaces, increase the risk of root caries occurrence[4]
Since root caries is caused, among other reasons, by a bacterial biofilm that adhere to exposed root surfaces, carious lesions can be prevented or even inactivated through the adoption of preventive actions such as the reduction of FDUERK\GUDWH LQWDNH ELR¿OP FRQWURO RUDO K\JLHQH LQVWUXFWLRQ DQG WKH XVH RI ÀXRULGH FRPSRXQGV16

Summary

Introduction

The increase in lifespan associated with the development and application of preventive dentistry concepts have contributed to the maintenance of the teeth in the oral cavity of elderly population. This dental longevity is accompanied by an increasing frequency of exposed root surfaces as a result of periodontal diseases, mechanical injury and/or surgical treatments. Since root caries is caused, among other reasons, by a bacterial biofilm that adhere to exposed root surfaces, carious lesions can be prevented or even inactivated through the adoption of preventive actions such as the reduction of FDUERK\GUDWH LQWDNH ELR¿OP FRQWURO RUDO K\JLHQH LQVWUXFWLRQ DQG WKH XVH RI ÀXRULGH FRPSRXQGV16. Researchers have shown that oral hygiene with ÀXRULGH FRPSRXQGV DQG WKH LQFRUSRUDWLRQ RI ÀXRULGH

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